KEAM 2021 Math Solved Paper

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Question : 40 of 120

Marks: +1, -0

The acute angle between the planes 2x−y−3z=7 and x+2y+2z=0 is

cos−1(
−√14
14
)
π−cos−1(
−√14
7
)
cos−1(
−√14
11
)
π−cos−1(
−√14
21
)
π−cos−1(
√14
7
)

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